<template>
   <view  class="cart-container" v-if="cart.length !== 0">
      <my-address></my-address>
      <!-- 购物车商品列表的标题区域 -->
      <view class="cart-title">
         <!-- 左侧的图标 -->
         <uni-icons type="shop" size="18"></uni-icons>
         <!-- 描述文本 -->
         <text class="cart-title-text">购物车</text>
      </view>
      <!-- 商品列表区域 -->
      <uni-swipe-action>
         <block v-for="(goods, i) in cart" :key="i">
            <uni-swipe-action-item :right-options="options" @click="swipeActionClickHandler(goods)">
               <!-- 在 radioChangeHandler 事件处理函数中，通过事件对象 e，得到商品的 goods_id和 goods_state -->
               <my-goods :goods="goods" :show-radio="true" :show-num="true" @radio-change="radioChangeHandler"
               @num-change="numberChangeHandler"></my-goods>
            </uni-swipe-action-item>
         </block>
      </uni-swipe-action>
      <!--结算区域-->
      <my-settle></my-settle>
   </view>
   <!-- 空白购物车区域 -->
   <view class="empty-cart" v-else>
      <image src="/static/cart_empty@2x.png" class="empty-img"></image>
      <text class="tip-text">空空如也~</text>
   </view>
</template>

<script>

import{mapGetters,mapState,mapMutations} from 'vuex'
import mixins from '@/mixins/tabber-badge'
import myGoods from '../goods/my_goods.vue';
import mySettle from '../my/my_settle.vue';
import myAddress from '../my/my_address.vue';
   export default {
  components: { myGoods, mySettle, myAddress },
      mixins:[mixins],
      data() {
         return {
            options: [{
               text: '删除', // 显示的文本内容
               style: {
                  backgroundColor: '#C00000' // 按钮的背景颜色
               }
            }]
         };
      },
      onLoad() {

      },
      onShow(){
         // 在页面刚展示的时候，设置数字徽标
         this.setBadge()
      },
      computed:{
         ...mapGetters('m_cart',['total']),
         ...mapState('m_cart',['cart'])
      },
      methods: {
         ...mapMutations('m_cart',['updateGoodsState','updateGoodsCount','removeGoodsById']),
         setBadge() {
            // 调用 uni.setTabBarBadge() 方法，为购物车设置右上角的徽标
            uni.setTabBarBadge({
               index: 2, // 索引
               text: this.total + '' // 注意：text 的值必须是字符串，不能是数字
            })
         },
         // 商品的勾选状态发生了变化
         radioChangeHandler(e) {
            this.updateGoodsState(e)
         },
         // 商品的数量发生了变化
         numberChangeHandler(e) {
            this.updateGoodsCount(e)
         },
         // 点击了滑动操作按钮
         swipeActionClickHandler(goods) {
            this.removeGoodsById(goods.goods_id)
         }

      }
   };
</script>

<style scoped lang="scss">
   .cart-title {
      height: 40px;
      display: flex;
      align-items: center;
      font-size: 14px;
      padding-left: 5px;
      border-bottom: 1px solid #efefef;
      .cart-title-text {
         margin-left: 10px;
      }
   }
   .cart-container {
      padding-bottom: 50px;
   }
   .empty-cart {
      display: flex;
      flex-direction: column;
      align-items: center;
      padding-top: 150px;
      .empty-img {
         width: 90px;
         height: 90px;
      }
      .tip-text {
         font-size: 12px;
         color: gray;
         margin-top: 15px;
      }
   }

</style>